/*
 * Proto Streamer
 * Copyright (C) 2009 John Pritchard.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */
package p.c;

import java.io.InputStream;
import java.io.IOException;

/**
 * @author jdp
 */
public class Input
    extends java.io.FilterInputStream
{

    private final StringBuilder linebuf = new StringBuilder();


    public Input(InputStream in)
        throws IOException
    {
        super(in);
    }


    public String readLine()
        throws IOException
    {
        StringBuilder linebuf = this.linebuf;
        String line;
        int ch;
        readl:
        while (true){
            switch (ch = this.in.read()){
            case -1:
                break readl;
            case '\r': 
                break;
            case '\n':
                break readl;
            default:
                linebuf.append((char)ch);
                break;
            }
        }

        line = linebuf.toString();
        if (null != line && 0 < line.length()){
            linebuf.setLength(0);
            return line;
        }
        else
            return null;
    }
}
